This is a performance improvement release:
* BitString type implementation rebased onto Python int to behave like
an integer and improve serialization performance (100x times!).
* Integer codecs reimplemented to base on Python's built-in integer
serialization codecs to improve serialization performance (~40%).
* Decoding performance of Set and Choice types improved by caching
once computed tags maps.
* ASN.1 character types refactored to duck-type unicode strings thus
making them more convenient in text processing context.
* Documentation updated at many places.
0.2.2
This release fixes a regression in Enumerated ASN.1 type subtyping
procedure.
Besides that, canonical decoders were hardened to reject non-canonical
serialization on input.
